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<title>18 Annotation</title>
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<H1><A NAME="SECTION0001800000000000000000"></A>
<a id='l2h-317' xml:id='l2h-317'></a>
<BR>
18 Annotation
</H1>
<A NAME="module-text-box"></A>
<P>
<dl><dt><b><span class="typelabel">class</span> <tt id='l2h-319' xml:id='l2h-319' class="class">text_box.T</tt></b>
<dd>
A text box is an optional element that adds a text box and arrows to a
chart. This class supports the following attributes:
</dl>
<P>
<dl><dt><b><tt id='l2h-320' xml:id='l2h-320' class="member">bottom_fudge</tt></b></dt>
<dd>
<b>Type:</b> length in points ( See Section <A href="unit.html#unit">4</A>)
<b>Default:</b> 5.
<P>
The amount of space below the last line
</dl>
<dl><dt><b><tt id='l2h-321' xml:id='l2h-321' class="member">fill_style</tt></b></dt>
<dd>
<b>Type:</b> fill_style.T
( see Section <A href="module-fill-style.html#module-fill-style">16</A>)
<b>Default:</b> fill_style.white.
<P>
Specifies the fill style of the text box.
</dl>
<dl><dt><b><tt id='l2h-322' xml:id='l2h-322' class="member">left_fudge</tt></b></dt>
<dd>
<b>Type:</b> length in points ( See Section <A href="unit.html#unit">4</A>)
<b>Default:</b> 5.
<P>
The amount of space left of the box
</dl>
<dl><dt><b><tt id='l2h-323' xml:id='l2h-323' class="member">line_style</tt></b></dt>
<dd>
<b>Type:</b> line_style.T
( see Section <A href="module-line-style.html#module-line-style">14</A>)
<b>Default:</b> line_style.black.
<P>
The line style of the surrounding frame.
</dl>
<dl><dt><b><tt id='l2h-324' xml:id='l2h-324' class="member">loc</tt></b></dt>
<dd>
<b>Type:</b> tuple
<b>Default:</b> (0, 0).
<P>
The location of the text box.
</dl>
<dl><dt><b><tt id='l2h-325' xml:id='l2h-325' class="member">radius</tt></b></dt>
<dd>
<b>Type:</b> length in points ( See Section <A href="unit.html#unit">4</A>)
<b>Default:</b> 0.
<P>
Radius of the four corners of the rectangle.
If the value is zero, a sharp-cornered
rectangle is drawn.
</dl>
<dl><dt><b><tt id='l2h-326' xml:id='l2h-326' class="member">right_fudge</tt></b></dt>
<dd>
<b>Type:</b> length in points ( See Section <A href="unit.html#unit">4</A>)
<b>Default:</b> 5.
<P>
The amount of space right of the box
</dl>
<dl><dt><b><tt id='l2h-327' xml:id='l2h-327' class="member">shadow</tt></b></dt>
<dd>
<b>Type:</b> (xoff,yoff,fill)
<b>Default:</b> None.
<P>
The value is either None or a tuple. When non-None,
a drop-shadow is drawn beneath the object. X-off, and y-off specifies the
offset of the shadow relative to the object, and fill specifies the
style of the shadow ( see Section <A href="module-fill-style.html#module-fill-style">16</A>).
</dl>
<dl><dt><b><tt id='l2h-328' xml:id='l2h-328' class="member">text</tt></b></dt>
<dd>
<b>Type:</b> str
<b>Default:</b> "???".
<P>
Text body. See Section <A href="module-font.html#module-font">17</A>
</dl>
<dl><dt><b><tt id='l2h-329' xml:id='l2h-329' class="member">top_fudge</tt></b></dt>
<dd>
<b>Type:</b> length in points (See Section <A href="unit.html#unit">4</A>)
<b>Default:</b> 0.
<P>
The amount of space (in points) above the first line
</dl>
<P>
In addition to the above attributes, this class
provides the following methods.
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-330' xml:id='l2h-330' class="method">add_arrow</tt></b>(</nobr></td>
<td><var>tip, tail=None, arrow=arrow.default</var>)</td></tr></table></dt>
<dd>
This method adds a straight arrow that points to <var>tip</var>, which is
a tuple of integers. Parameter <var>tail</var>
specifies the starting point of the
arrow. It is either None or a string consisting of the following
letters:
<BLOCKQUOTE>
'l', 'c', 'r', 't', 'm,', 'b'
</BLOCKQUOTE>
<P>
Letters 'l', 'c', or 'r'
means to start the arrow from the left, center, or right of the text
box, respectively. Letters 't', 'm', or 'b' means to start the arrow
from the top, middle or bottom of the text box. For example, when
<code>tail = 'tc'</code> then arrow is drawn from top-center point of the text
box. Parameter <var>arrow</var> specifies the style of the arrow.
<P>
<div class="seealso">
<p class="heading">See Also:</p>
Section <A href="module-arrow.html#module-arrow">19</A> for arrows.
</div>
</dl>
<P>
<IMG
WIDTH="494" HEIGHT="272" ALIGN="BOTTOM" BORDER="0"
SRC="./annotations.png"
ALT="Image annotations">
<P>
<b> Annotations example </b>
<P>
Below is the source code that produces the above chart.
../demos/annotations.py
<P>
<div class="verbatim"><pre>
from pychart import *
tb = <a href="module-text-box.html">text_box.T</a>(loc=(100,100), text="Without frame")
tb.add_arrow((50, 100))
tb.add_arrow((180, 100))
tb.draw()
tb = <a href="module-text-box.html">text_box.T</a>(loc=(100,130), text="/hCMulti\n/bLine")
tb.add_arrow((50, 120))
tb.add_arrow((180, 100))
tb.draw()
tb = <a href="module-text-box.html">text_box.T</a>(loc=(100,160), text="Fat arrow", line_style=None)
tb.add_arrow((180, 140), tail='rm', arrow = arrow.fat1)
tb.draw()
<a href="module-text-box.html">text_box.T</a>(loc=(180, 100), text="/a90Funny background",
fill_style = <a href="module-fill-style.html">fill_style.</a>gray70).draw()
<a href="module-text-box.html">text_box.T</a>(loc=(180, 140), text="/hL/20Big/oText\n/24/bHuge/oText",
fill_style = None).draw()
</pre></div>
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<span class="release-info">Documentation released on July 2, 2005.</span>
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